Si

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Si,

river, China: see XiXi
or Xi Jiang
, great river of S China, c.1,250 mi (2,010 km) long, rising in E Yunnan prov. and flowing generally E through Guangxi and Guangdong provs. to the South China Sea near Guangzhou; the Kui, Bei, and Dong rivers are its chief tributaries.
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Si,

symbol for the element siliconsilicon,
nonmetallic chemical element; symbol Si; at. no. 14; interval in which at. wt. ranges 28.084–28.086; m.p. 1,410°C;; b.p. 2,355°C;; sp. gr. 2.33 at 25°C;; valence usually +4.
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SI:

see International System of UnitsInternational System of Units,
officially called the Système International d'Unités, or SI, system of units adopted by the 11th General Conference on Weights and Measures (1960). It is based on the metric system.
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Si

(chemistry)

SI

International System of Units (SI)

A system of units based on the following fundamental quantities: metre, kilogram, second, ampere, kelvin, candela, and mole.

SI

Xi

, Hsi, Si
a river in S China, rising in Y?nnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)

SI

(unit)
Syst?me International.

SI

(character)

si

(networking)
The country code for Slovenia.

SI units

(Système International d'Unites; International System of Units) A system of standard units of measurement finalized at the 14th General Conference on Weights and Measures in 1971. It is based on seven units of measure, including three from the MKS system (meter-kilogram-second), the ampere for electrical current, the Kelvin for temperature, the candela for luminosity and the mole for molecular weight. See MKS system, amp, Kelvin, candela and mole.

BASIC SI UNITS Quantity        Unit of Measurement

 length (l)      meter (m)
 mass (m)        kilogram (kg)
 time (t)        second (s)
 current (I)     ampere (A)
 temperature     kelvin (K)
 atomic weight   mole (mol)
 luminosity      candela (cd) 


 DERIVED SI UNITS Quantity             Unit of Measurement

 force (f)            newton (N)
 work (W)             joule (J)
 power (P)            watt (W)
 pressure (P)         pascal (pa)
 frequency (f)        Hertz (Hz)
 electric charge (Q)  coulomb (C)
 potential (V)        volt (V)
 capacitance (C)      Farad (F)
 resistance (R)       ohm

silicon

(Si) The base material used in chips. Pronounced "sil-i-kin," not "sil-i-cone," the latter used to make sealants (see silicone), silicon is the most abundant element in nature next to oxygen. It is found in a natural state in rocks and sand, and its atomic structure makes it an ideal semiconductor material. For chip making, silicon is mined from white quartz rocks and put through a chemical process at high temperatures to purify it. Pure silicon is not electrically conductive. In order to make it conductive, it is chemically combined with other materials such as boron and phosphorus (see doping). See silicon germanium and black silicon.


A Silicon Moon
This stylized image symbolizes that chips are made from the same material found in sand. The "moon" is a finished wafer containing memory chips. (Image courtesy of Texas Instruments, Inc.)








Drawing the Silicon Ingot
An ingot is being drawn from a furnace containing molten silicon. High-speed saws slice the ingots into wafers about the thickness of a dime, which are then ground and polished mirror smooth. (Image courtesy of Texas Instruments, Inc.)

systems integrator

An individual or organization that builds systems from a variety of diverse components. With increasing complexity of technology, more customers want complete solutions to information problems, requiring hardware, software and networking expertise in a multivendor environment.

Some of the major systems integrators are Accenture (formerly Andersen Consulting), Price Waterhouse, Computer Sciences Corporation, IBM Global Services, HP, Ernst & Young, EDS and Deloitte Consulting. See OEM, VAR and NASI.